Aspecial election was held inMassachusetts's 12th congressional district on September 17, 1804, to fill a vacancy left by the resignation ofThomson J. Skinner (DR) on August 10, 1804[1]
| Candidate | Party | Votes[2] | Percent |
|---|---|---|---|
| Simon Larned | Democratic-Republican | 1,241 | 61.9% |
| Daniel Dewey | Federalist | 765 | 38.1% |
Larned took his seat on November 5, 1804, at the start of the 2nd session[3]